Question: Which is the fictional person that is said to be the same as Superman?
Paraphrase: Which is the anecdotal individual that's said to be the same as Superman?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P460 wd:Q79015 . ?sbj wdt:P31 wd:Q15632617 } 
Answer: Clark Kent